Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c77e07b42ccd17…

MALICIOUS

PDF

91.4 KB Created: 2021-09-06 16:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fc4af48cf513ca3659df266d4b8f8c17 SHA-1: 7f3b4d54836c4eadd653424797a14a5fc683e4c3 SHA-256: 85c77e07b42ccd17601e5da8e9fe0b4fdf3a84bba1b3bfe57789f122ea0d2494
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely serve as lures for phishing attacks or to distribute further malware. The PDF's structure and the nature of the embedded links suggest it was intended to exploit users' trust by appearing to offer legitimate content while redirecting them to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896748ca522---30105880241.pdf In PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/62463035894.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/a90192f4082c4eab76d8da8341a1a965/wedonezo.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/baximowipetizuwef.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/94171815038.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/74182d14bdb5e346f7c79cb1974b18aa/46512172709.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/eddecec9358003b0dd4892d5b8a0920e/kajasefolirulitijegagaves.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/vugore.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612948818182b---6297882545.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/varodikuveripifubapinifo.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/62ce60c2379d5b0a8ebec9bbdf575260/52015948723.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/60315869351.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/91464317359.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/tilesidebonalekomu.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba05001acb4---74860273003.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/vufobojinativedip.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1567b9b04---39862196295.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/78302634855.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/17618880141.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/82568353222.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106fd2617b29---53706241471.pdfIn PDF document text
    • http://altinay-law.com/images/file/gabiwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=exercices+conditionnel+fran%C3%A7ais+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88E 20540 bytes
SHA-256: 8af7baabaf8a1f6a7579987a3d5b7240371197ffde9872b893ca3e0236921d21
font_01_sfnt_off00012c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5E 10896 bytes
SHA-256: 0092b620b3272c480f6ae864adde12042ccbe99de07e7d460a9c10f322f93da6
font_02_sfnt_off0001456c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1456C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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